Piston pump



Dec. 25, 1956 A. BUCHMA'NN PISTON PUMP 2 Sheets-Sheet 1 Filed April 8, 1952 9 6 6 zi T 2T L 3 v 5 2 M #2 2 ww I 6 75 My $6 Mm AMY 5 7 7 NJ 24M. 4 W w 18 5 %w 7 m T T WM o WM w A L B 2 M A. BUCHMANN PISTON PUMP Dec. 25, 1956 2 Sheets-Sheet 2 Filed April 8, 1952 INVENTOR. ALB/I1 Bu HMAH/ w iw United States Patent PISTON PUMP Albin Bnchmann, Solenre, Switzerland, assignor to Scintilla Ltd., Soleure, Switzerland Application April 8, 1952, Serial No. 281,216

Claims priority, application Switzerland April 10, 1951 17 Claims. tor. 103-154 The present invention relatesto piston pumps for pumping voltatile liquids, and more particularly to a fuel supply arrangement for a combustion engine.

The known piston pumps are not suitable for the pumping of volatile liquids because a negative pressure is created in the cylinder during the suction stroke of the piston which causes vaporization of the conveyed liquid. Consequently, together with the liquid, vapors are sucked into the cylinder of the piston pump resulting in low efficiency of the pump and variations in the amount of the pumped liquid.

It is the object of the present invention to overcome this disadvantage by admitting a liquid to be pumped to the pump cylinder without applying negative pressure.

It is another object of the present invention to arrange in a piston pump an inlet passage in such a manner that during movement of the pump piston in one direction the inlet passage is closed by the piston, and during movement in the opposite direction such inlet passage is opened by the piston.

It is a further object of the present invention to provide in a piston pump longitudinally extending inlet slots in the pump piston which coincide with inlet passages in the pump cylinder in one position of the pump piston, and to mount the piston turnably in the cylinder permitting rotation of the piston to another position in which the inlet slots therein are angularly spaced from the inlet passages in the pump cylinder so that the same are closed.

It is still another object of the present invention to provide actuating means for turning the pump piston during reciprocating movement thereof so that at least during part of the reciprocating movement of the piston in one direction, the inlet slots coincide with the inlet passages in the cylinder and at least during part of the movement in the opposite direction the inlet slots are angularly spaced from the inlet passages.

It is also an object of the present invention to provide means for adjusting the moment of turning of the piston with respect to the reciprocating movement thereof. With these objects in view the present invention mainly consists in a pump comprising a cylinder member having at least one inlet passage and at least one outlet passage; a piston member mounted in the cylinder member and defining in the same an operating chamber communicating with the outlet passage, the piston member being formed with at least one inlet conduit communicating at one end thereof with the operating chamber, one of the members being reciprocable relative to the other of the members for increasing and reducing, respectively, the volume of the operating chamber, and one of the members being turnable relative to the other of the members between a first position in which the inlet conduit coincides with the inlet passage and a second position in which the inlet conduit is angularly spaced from the inlet passage; drive means; first actuating means connected to the drive means and being driven by the same, the first actuating means engaging the reciprocabie member; for reciprocating the "ice same; second actuating means connected to the turnable member for turning the same relative to the other of the members between the first and second positions; and adjustable control means connecting at least the second actuating means with the drive means for operating the first and second actuating means in a predetermined timed sequence in such manner that at least during part of the reciprocating movement of the reciprocable member for increasing the volume of the operating chamber the turnable member is in the first position thereof, and that at least during part of the reciprocable movement of the reciprocating member in opposite direction for reducing the volume of the Working chamber the turnable member is in said second position.

A preferred embodiment of the present invention mainly consists in a piston pump comprising a piston member turnably and reciprocably mounted in a cylinder member. The cylinder member is provided with at least one lateral inlet passage, while the piston member has an inlet slot which in one position of the piston member co incides with the inlet passage. However, the piston member may be turned to a position in which the inlet slot is angularly spaced from the inlet passage in the cylinder member. Consequently, in one position of the piston member the operating chamber within the cylinder member communicates through the inlet slot in the piston member with the inlet passage, permitting admission of fluid into the cylinder, while in another position of the piston member the inlet passage is closed by the cylindrical surface of the piston member.

Means are provided for reciprocating the piston member in the cylinder member in such a manner that during at least part of the suction stroke the piston member is in the position in which the inlet slots therein coincide with the inlet passages in the cylinder member, while during the compression stroke the inlet slots are angularly spaced from the inlet passage so that a fluid may be discharged through an outlet in the cylinder member.

Particularly when several pumps according to the present invention arearranged for simultaneous operation it is advantageous to mount the cylinder members turnably in a supporting body, and to provide means for adjusting the relative position of the cylinder member and the piston member, and of the inlet passages and inlet slots, respectively.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

Fig. 1 is a longitudinal sectional view of a fuel supply arrangement according to the present invention on line 11 in Fig. 4;

Fig. 2 is a fragmentary cross-sectional view on line 2-2 showing an adjusting arrangement for a pump cylinder;

Fig. 3 is a cross-sectional view on line 3-3 of Fig. l; and

Fig. 4 is a cross-sectional view on line 44- of Fig. 1.

Referring now to the drawings, in a supporting body 1 a set of cylinder members 3 is mounted in bores 3" of the supporting body. For each cylinder of the internal combustion engine to which liquid fuel is to be supplied, a piston member and a cylinder member is provided. The axes of the bores 3' and of the cylinder members 3 are parallel to, and spaced equal distances from the axis of the shaft 2, which is also rotatably mounted in the supporting means 1, 14. Shaft 2 is driven and constitutes a a drive means for the fuel supply arrangement. Each cylinder member 3 is provided with an outer shoulder 4 abutting against a corresponding shoulder in the supporting'body 1 and is pressed against the'same by a .threaded member 5 engaging a thread 5' in the supporting body. In each cylinder member a piston member 6 is mounted reciprocably and turnably. In the outlet passage of each cylinder member a check valve 7 is arranged which is pressed by the spring 8 against'a conical seat 7 on the cylinder member. At the upper end of each'threaded member 5, a tubular member 9 is mounted which 1 communicates with one cylinder of an internal combustion engine. Each check valve 7 has an actuating portion 7 projeeting into the corresponding cylinder member 3. During part of its upward movement the piston member 6 engagesthe actuating portion 7" and opens thereby the check valve 7 against the action of spring 8.

In the supporting body 1 inlet means 10 are provided communicating with an inlet conducit 24 in the supporting body 1 which leads to an annular recess 11 of one cylinder member. Two diametrically arranged inlet conduits 12 connect each annular recess 11 With the interior of the cylinder member, while the annular recess 11 of all cylinder members communicate through a-connecting conduit 25. The piston member 6 is formed at the upper endthereof with two elongated diametrically arranged inlet slots 13 ending in the transversal end face thereof. As can'be best seen from Fig. 4, the inlet slots '13 coincide with. the inlet conduits 12 in one position 6 of the piston member, and are angularly spaced therefrom in another turned position 6 of the piston member.

Coaxially with the supporting body 1, a cover member 14 is arranged secured by screws 15 to the supporting body and constituting a supporting means for the shaft In order to reciprocate thelower end of the'actuating member which is slidably and non-rotatably mounted'in the annular supporting means 19 which is securedto the supporting body by screws 26. The cam wheel '18 is rotatably supported by roller bearings 17. During the rotation of the cam wheel *18, the cam portion-18 engages consecutively each of the actuating members 20 urging the corresponding piston member 6 upwardly against the action of spring means 23,

To the lower end of each piston member 6 a horizontal rocking lever means 21 is fixedly secured engaging a square portion of the piston member so that each piston member is turned when the corresponding rocking lever is rocked. Rocking levers 21 are part of second actuating means which further include actuating cam means 22 which are non-rotatably, but longitudinally slidably mounted on the shaft 2. During rotation of the shaft 2, 'the actuating cam means 22 consecutively rock each of the rocking levers 21 in one'direction against the action of the coil springs 23 which are secured at one end to the supporting body land at the other end to the rocking levers 21.

The actuating cam means 22 may be moved in an axial direction of shaft 2. A pin 28 passing through a slot 29 in the shaft means 2 is secured to the actuating'cam means 22 and to a controlrod 27which isinserted into an axial bore of shaft 2. The control rod 27 is supported at the upper end thereof in bearing means 30 and rotates with the shaft 2. Operating means are provided for operating the control rod 27, such operating means including a first clamping member 31 which is non-rotatably and longitudinally slidably mounted in the supporting body, and a-second cIa'm'ping'm'ember-SZ integral with a rod34. The bearing 30 -is clamped between the clamping members 31'and 32'sothat-by moving 'the'rod 34 in her.

'4 axial direction of the shaft 2, the actuating cam means 22 may be moved along shaft 2.

The outermost surface portions 22' of the actuating cam means 22 are located on a curve so that the intervals between the reciprocating strokes and the turning movements of the piston membersmay be adjusted within wide limits by moving the actuating cam means 22 along shaft 2. In the event that the curve of the outermost surface portions 22' extends in a plane passing through-the axis of the shaftmeans2,'the turning angle of the piston mem her and thereby the time period during which the inlet slots 13 do not coincide with the inlet passages 12 may be adjusted by axially sliding the cam means 22. In the event that the curve of the outermost surface portions of the cam means '22 extends partly around shaft 2, or in a plane intersecting the axis of the shaft 2 the moment of actuation of the piston member for turning relative to the cylinder member may also bevaried with respect to the reciprocating strokes of the piston member'by axial adjustment of the actuating cam'means-22.

During assembly of the apparatus it is necessary to exactly adjust the inlet conduits 12 with respect to the inlet slots 13 'so that they may coincide in a predetermined relative position of-the cam means 18and 22. For this purposethe cylinder members 3 are turnably mounted in the supporting body 1. Each cylinder member is provided on the outer surface thereof with an annular gear means 3', as can be best seen from Fig. 2, while in the supporting body 1 set screws 35 are mounted provided with a Worm gear thread and meshing with the gear me'ans'3'. By rotating the respective set screws 35 and the. gear means 3 the position of the cylindermembers 3 may be exactly adjusted relatively'to the piston mem- A spring ring 36r'nounted in an annular groove of the supporting body serves as a stop means preventing axial movement of the worm screw 35, while a further screw 37 closes theopeningin'the'supporting body into which the set screw 35 is mounted.

The "device operates in thefollowing manner:

First the threaded members 5 are loosened so that the cylinder members 3 maybe turne'dja'nd thereupon the cylinder members are turned by means of 'worm screws 35 'to a position in which the inlet passages 12 coincide with the inlet slot '13 while the piston members are in a position corresponding to a suction stroke.

Thereupon the cylinder members 3 are secured in this position by tighteningthe threaded members '5. When shaft 2, constituting a drive'means, 'is rotated,'the'cam wheel 18 engages with the cam portion 18', constituting first actuatin'g'means, thereof'cons'ecutively each of the actuating members 20 so that consecutively each of the piston membersismoved towards the upper end of the respective cylinder member'which is closed by the springloaded check valve 7. During'suchmovenient cam 22, constituting a second actuating meansyengages the 'rocking levers 21 and turns the respective piston member so that'the inlet slots 13 are angularly' sp'a'ced'from the inlet passages 12 and a fluidin theoperating chamber between the end face of the piston member 6and' the check valve 7 isdischargedthrough'the'tubular member 9 into the respective cylinder'of the internal "combustion engine. 'After the projecting cam portion 18 has passed over the actuatingmember 20'engaging one of the piston members 3, such piston 'member 'nioves downwardly under the action of spring means 23*a'nd is turned at least {during part of 'such movement and while 'i n'iits lower'position'by springmeans 23 to'a position in'which the inlet'slots 13 coincide withtheinlet passages 12,'the shape of'the' actuating cam'means 22 permitting such re turn movement. Sinc'e'both cam means '18 a'nd2'2 rotate'with the shaft 2,'each"pistonmember 6 isturned I during each reciprocating stroke. Preferably the piston 'membe'rfis in 'thefposition 6',=s'how'n inFig. 4, fromthe end of the compression stroke" to theen'd-of the following 's'ucti'on stroke, in"wliieh inoir'ientthe piston'member is turned to the position 6" so that the connection between the inlet passsage and the interior of the cylinder member is interrupted. The piston member may remain in position 6" during the compression stroke, either until immediately before the start of the following suction stroke or until any other desired moment, such adjustment being possible in accordance with the desired variation of the filling of the cylinder, or the load of the engine, respectively, by moving the actuating cam means 22 by control means 2%, 27, 34, 31, 32 in axial direction of the shaft 2. Since the outermost surface portions of the cam means 22 are located on a curve, the intervals between the reciprocating stroke and the turning movement of the piston members are variable within wide limits and the operations can be carried out in a desired timed sequence.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of a fuel supply arrangement for a combustion engine differing from the types described above.

While the invention has been illustrated and described as embodied in a piston pump in which admission of fluid is controlled by a turning movement of the pump piston during the reciprocation thereof, it is not intended to be limitedto the details shown, since various modifications and structural changes may be made Without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. A pump, comprising, in combination, supporting means: at least one cylinder member mounted in said supporting means, said cylinder member being closed at one end and formed with at least one inlet passage and at least one outlet passage; spring-loaded check valve means located in said outlet passage of said cylinder member; a piston member turnably and reciprocably mounted in said cylinder member and having a cylindrical outer surface and a transversal end face located oppositely the closed end of said cylinder member and defining in said cylinder member an operating chamber communcating with said outlet passage, said piston member being formed with at least one elongated inlet slot in said cylindrical surface thereof ending in said transversal end face thereof; driven shaft means rotatably mounted in said supporting means; a cam wheel fixedly mouned on said shaft means and engaging said piston member, and moving said piston member during rotation of said cam wheel toward the closed end of said cylinder member; spring means for urging said piston member toward said cam wheel; movable actuating means connected to said piston member for turning said piston member in said cylinder member between a first position in which said inlet slot coincides with said inlet passage, and a second position in which said inlet slot is angularly spaced from said inlet passage; and adjustable control means connecting said actuating means with said shaft means for operating said actuating means in a timed sequence with said cam wheel in such manner that at least during part of the reciprocating movement of said piston member in the direction away from said closed end of said cylinder member said inlet slot is in said first position thereof, and that at least during part of the reciprocating movement of said piston member in the opposite direction said inlet slot is in said second position thereof.

2. A pump, comprising, in combination, supporting means; at least one cylinder member mounted in said supporting means, said cylinder member being closed at one end and formed with at least one inlet passage and at least one outlet passage; spring-loaded check valve means located in said outlet passage of said cylinder member; a piston member turnably and reciprocably mounted in said cylinder member and having a cylindrical outer surface and a transversal end face located oppositely the closed end of said cylinder member and defining in said cylinder member an operating chamber communicating with said outlet passage, said piston member being formed with at least one elongated inlet slot in said cylindrical surface thereof ending in said transversal end face thereof; driven shaft means rotatably mounted in said supporting means; actuating means fixedly mounted on said shaft means reciprocating said piston member; rocking lever means fixedly connected at one end thereof to said piston member, said rocking lever means extending normal to the direction of reciprocation of said piston member; actuating cam means mounted on said shaft means and engaging the other end of said rocking lever rocking the same during rotation of said shaft means and thereby turning said piston member in said cylinder member between a first position in which said slot coincides with said inlet passage, and a second position in which said slot is angularly spaced from said inlet passage, said shaft means operating said cam wheel and said actuating cam means in such manner that at least during part of the reciprocating movement of said piston member in the direction away from said closed end of said cylinder member said inlet slot is in said first position thereof, and that at least during part of the reciprocating movement of said piston member in the opposite direction said inlet slot is in said second position thereof.

3. A pump, comprising, in combination, supporting means; at least one cylinder member mounted in said supporting means, said cylinder member being closed at one end and formed with at least one inlet passage and at least one outlet passage; spring-loaded check valve means located in said outlet passage of said cylinder member; a piston member turnably and reciprocably mounted in said cylinder member and having a cylindrical outer surface and a transversal end face located oppositely the closed end of said cylinder member and defining in said cylinder member an operating chamber communicating with said outlet passage, said piston member being formed With at least one elongated inlet slot in said cylindrical surface thereof ending in said transversal end face thereof; driven shaft means rotatably mounted in said supporting means;'actuating means fixedly mounted on said shaft means reciprocating said piston member; rocking lever means fixedly connected at one end thereof to said piston member, said rocking lever means extending normal to the direction of reciprocation of said piston member; actuating cam means mounted on said shaft means non-rotatably and slidably in axial direction of said shaft means, said actuating cam means having the the outermost surface portions thereof located along a curve, said actuating cam means engaging during rotation thereof the other end of said rocking lever means with said outermost surface portions rocking the same during rotation of said shaft means and thereby turning said pioston member in said cylinder member between a first position in which said slot coincides with said inlet passage, and a second position in which said slot is angularly spaced from said inlet passage, the actuation and turning of said piston member with respect to the reciprocating movement thereof depending on the shape of said curve and the displacement of said actuating cam means in axial direction of said shaft means; and control means mounted in said supporting means and engaging said actuating cam means for moving the same in axial direction of said shaft means, said shaft means operating said cam,

7 wheeland 'said' actuating cam rneans in such manner that "at leastduringpart of the reciprocating movement of said pistonnne'mber in'the direction 'away from said closed end 'of'said cylinder'member said inlet slot is in said first position thereof, and that at least during part of the reciprocating movement of said piston member in the "opposite directionsaid inlet slot is in said second position thereof.

"member; a piston member turnably and reciprocably -mounted insaid cylinder member and having a cylin- 'clrical outersurface and a transversal end face located "oppositely the closed end of said cylinder men'iber and definingin said cylinder member an operating chamber communicating with said outlet passage, said piston member being formed with at least one elongated inlet slot in said cylindrical surface thereof ending in said transversal end face thereof; driven shaft means rotatably mounted in said supporting means and formed with a cylindrical'coaxial inner bore and a pair of diametrically arranged aligned slots connecting said cylindrical inner bore with the outer surface of said shaft means; actuating means fixedly mounted on said shaft means reciprocating said piston member; rocking lever means fixedly connected at one end thereof to said piston member, and extending substantially normal to the direction of reciprocation of said piston member; actuating cam means mounted on said shaft means non rotatable and slidable in axial direction of said shaft means, said actuating cam means including a cam having the outermost surface portions thereof located on a line extending at an angle to the axis of rotation of said shaft means, said surface 'portions'engaging during rotation of said shaft means the other end of said rocking lever, rocking the same and thereby turning said piston member in said cylinder member between a first position in which said inlet slot coincides with said inlet passage, and a second position in which said inlet slot is angularly spaced from said inlet "passage; a control rod rotatably mounted in said sup- 'ably in an axial direction thereof so that axial displacement of said control rod effects axial displacement of said actuating cam means whereby the actuation and turning of said piston member may be adjusted with respect to the reciprocating moment thereof by moving said actuating cam means in axial direction; and operating means longitudinally slidably and non-rotatably mounted in said supporting means, and including bearing means rotatably supporting said control rod, the relative positionof said actuating means andsaid actuating cam means being such that at least during part of the reciprocating movement'of said piston member in the direction away from said closed end of said cylinder member said inlet slot is in said 'first position thereof, and that at least during part of said reciprocating movement of said piston member in the opposite direction said inlet slot is in said second position thereof.

5. A pump, comprising, in combination, supporting 'means formed with at least one inlet conduit; at least one cylinder member rotatably mounted in said supporting means, said cylinder member being closed at one end and formed with at least one'inlet passage in the region of said inlet conduit'in said supporting means, and at least oneo'tltlet'passagmi'spring-loadedcheck valve means lo- ""ca ted in said 'outletfpassage of'said cylinder member; annular gear'mea'ns" extending around the outer surface of said cylindermember; a piston member turnably and 'reciprocably mounted in said cylinder member andhaving a cylindrical outer surfaceand a transversal end face located oppositely the closed end of said cylinder member and defining in said cylinder member an operating chamber communicating with said outlet passage, said piston member being formed with at least one elongated inlet slot in said cylindrical surface thereof ending in said transversal end face thereof; Worm gear means rotatably n'ionnted in said supporting means extending normal to the axis of said cylinder member and meshing with said annular gear means and adapted to rotate said cylinder member so as to permit adjustment of said cylinder member to a position in which said inlet passage in said cylinder member and said inlet slot in said piston member driven shaft means rotatably mounted in said porting means; actuating means fixedly mounted on sail shaft means reciprocating said piston member; rocking lever means fixedly connected at one end thereof to said piston member, said rocking lever means extending normal to the direction of reciprocation of said piston member; actuating cam means mounted on said shaft means and engaging the other end of said rocking lever rocking the same during rotation of said shaft means and thereby turning said piston member in said cylinder member between a first position in which said slot coincides with said inlet passage, and second position in which said slot is angularly spaced from said inlet passage, said shaft means operating said cam wheel and said actuating cam means in such manner that at least during part of the reciprocating movement of said piston member in the direction away from said closed end of said cylinder member said inlet slot is in said first position thereof, and that at least during part of the reciprocating movement of said piston member in the opposite direction said inlet slot is in said second position thereof.

6. A pump, comprising, in combination, a cylinder member closed at one end and formed with at least one inlet passage and at least one outlet passage; a piston member turnably and reciprocably mounted in said cylinder member and having a cylindrical outer surface and a transversal end face located oppositely the closed end of said cylinder member and defining in said cylinder member an operating chamber communicating with said outlet passage, said piston i'nember being formed with at least one elongated inlet slot in said cylindrical surface thereof ending in said transversal end face thereof; driven shaft means rotatabiy mounted in said supporting means; actuating means fixedly mounted on said shaft means reciprocating said piston member; rocking lever means fixedly connected at one end thereof to said piston member, said rocking lever means extending normal to the direction of reciprocation of said piston member; actuating cam means mounted on said shaft means non-rotatably and slidably in axial direction of said shaft means, said actuating cam means having the outermost surface portions thereof located along a curve, said actuating cam means engaging during rotation thereof the other end of said rocking lever with said outermost surface portions rocking the same during rotation of said shaft means and thereby turning said piston member in said cylinder member between a first position in which said slot coincides with said inlet p ssage, and a second position in which said slot is angularly spaced from said inlet passage, the actua tion and turning of said piston member with respect to the reciprocating movement thereof depending on the shape of said curve and the displacement of said actuating cam means in axial direction of said shaft means; and control means mounted in said supporting means and engaging said actuating cam means for moving the same in axial direction of said shaft means, said shaft means eating movement of said pistonlmember in thedirection away fromsaid'closed en'dof said cylindermembersaid during part of the reciprocating movement of said piston member in the opposite direction said inlet slot is in said second position thereof.

,7. A fuel supply arrangement, comprising, in combination, a supporting body formed with a set of parallel t elongated cylindrical bores, and further formed with a connecting conduit connecting said cylindrical bores and extending in a plane normal to the axes of said cylindrical bores, said supporting body being further formed with at least one inlet conduit extending from the outside thereof to said connecting conduit; a set of cylinder members, each cylinder member mounted in one of said elongated cylindrical bores of said supporting body, each cylinder member being closed at one end and formed with at least one inlet passage communicating with said connecting conduit in said supporting body, and further formed with at least one outlet passage located at said closed end thereof; a set of spring-loaded check valves mounted in said supporting body, each check valve located in the outlet passage of one of said cylinder mem bers; a set of piston members, each piston member turnably and reciprocably mounted in one of said cylinder members and having a cylindrical outer surface and a transversal end face located oppositely the closed end of the corresponding cylinder member, and defining in said cylinder member an operating chamber communicating with said outlet passage in said cylinder member, each piston member being formed with at least one elongated inlet slot in said cylindrical surface thereof ending in said transversal end face thereof; driven shaft .means rotatably mounted in said supporting body and having an axis of rotation extending parallel to, and equally spaced from the axes of said cylindrical bores and said cylinder members; cam wheel means fixedly mounted on said shaft members in the corresponding cylinder member between a first position in which said inlet slot thereof coincides with said inlet passage in the corresponding cylinder member and a second position in which said inlet slot is angularly spaced from said inlet passage, said actuating cam means turning consecutively each of said piston members to said second position at least during part of the reciprocating movement thereof towards said closed end of the corresponding cylinder member.

8. A fuel supply arrangement, comprising, in combination, a supporting body formed with a set of parallel elongated cylindrical bores, and further formed with a connecting conduit connecting said cylindrical bores and extending in a plane normal to the axes of said cylindrical bores, said supporting body being further formed with at least one inlet conduit extending from the outside thereof to said connecting conduit; a set of cylinder members, each cylinder member mounted in one of said elongated cylindrical cores of said supporting body, each cylinder member being closed at one end and formed with at least one inlet passage communicating with said connecting conduit in said supporting body, and further formed with at least one outlet passage located at said closed end thereof; a set of spring-loaded check valves mounted in said supporting body, each check valve located in the outlet passage of one of said cylinder members; a set of piston members, each piston member turnably and reciprocably mounted in one of said cylinder members and having a cylindrical outer surface and a transversal end face located oppositely the closed end of the corresponding cylinder member, and defining in t '10 said cylinder member an operating chamber communi eating with said outlet passage in said cylinder member, each piston member being formed with at least one elongated inlet slot in said cylindrical surface thereof ending in said transversal end face thereof; driven shaft means rotatably mounted in said supporting body and having an axis of rotation extending parallel to, and equally spaced from the axes of said cylindrical bores and said cylinder members; a set of actuating members mounted in said supporting body, each actuating memher being arranged coaxially with one of said piston members and being slidable in the direction of reciprocation thereof; cam wheel means fixedly mounted on said shaft means, said cam wheel means having an actuating cam portion spaced from the axis of rotation of said shaft means the same distance as said cylindrical bores, said actuating cam portion engaging during rotation of said shaft means consecutively each of said actuating members at the other end thereof so as to move the same, and thereby the piston member corresponding thereto toward said closed end of the corresponding cylinder member; a set of rocking lever means, each fixedly connected at one end thereof to one of said piston members, each rocking lever means extending substantially normal. to the direction of reciprocation of said piston member; spring means connected to said rocking lever means for urging said rocking lever means in one direction; and actuating cam means mounted on said shaft means and engaging the other ends of said rocking lever means consecutively during rotation of said shaft means and turning said rocking lever means against the action of said spring means whereby each of said piston members is turned in the corresponding cylinder member between a first position in which said inlet slot thereof coincides with said inlet passage in the corresponding cylinder member and a second position in which said inlet slot is angularly spaced from said inlet passage, said actuating cam means turning consecutively each of said piston members to said second position at least during part of the reciprocating movement thereof towards said closed end of the corresponding cylinder member.

9. A fuel supply arrangement, comprising, in combination, a supporting body formed with a set of parallel elongated cylindrical bores, and further formed with a connecting conduit connecting said cylindrical bores and extending in a plane normal to the axes of said cylindrical bores, said supporting body being further formed with at least one inlet conduit extending from the outside thereof to said connecting conduit; a set of cylinder members, each cylinder member mounted in one of said elongated cylindrical bores of said supporting body, each cylindermember being closed at one end and formed with at least one inlet passage communicating with said connecting conduit in said supporting body, and further formed with at least one outlet passage located at said closed end thereof and communicating with one of the cylinders; a set of spring-loaded check valves mounted in said supporting body, each check valve located in the outlet passage of one of said cylinder members; a set of piston members, each piston member turnably and |recip rocably mounted in one of said cylinder members and having a cylindrical outer surface and a transversal end face located oppositely the closed end of the corresponding cylinder member, and defining in said cylinder memher an operating chamber communicating with said outlet passage in said cylinder member, each piston memher being formed with at least one elongated inlet slot in said cylindrical surface thereof ending in said transversal end face thereof; driven shaft means rotatably mounted in said supporting body and having an axis of rotation extending parallel to, and equally spaced from the axes of said cylindrical bores and said cylinder members; a set of actuating members mounted in said support ing body, each actuating member being arranged coaxial- 1y, with one of said piston members and being slidable in 'thedire'ction of reciprocation thereof; cam Wheel 'meansfixedlyniounted on said" shaft means, said cam *wheel'means'having an actuating cam portion spaced f-rom'the axis of rotation of said shaft means the same distance as 'said cylindrical bores, said actuating cam portion engaging during rotation of said shaft means consecutively' each of saidactuating members at the other end thereof soas to move the same, and thereby the piston'rnember corresponding thereto toward said closed end of the corresponding cylinder member; a set of rocking'lever means, each fixedly connected at one end thereof-to one of said piston members, each rocking lever means extending substantially normal to the direction of reciprocation of said piston member; spring means urging said rocking levermeans'in one direction; actuating cam meansmouuted'on-said shaft means and e gaging the other ends of said rocking lever means consecutively during rotation of said shaft means and turning said rocking lever means against the action of said spring means Whereby each of said pistonmembers'isturned in the corresponding cylindermemberbetween a first position in Whichsaid inlet slot thereof coincides with said inlet passage in the corresponding cylinder member and a second position in which said inlet slot is angularly spaced from said inlet passage, said actuating cam means turning consecutively each of said piston members to said second position at least during part of the reciprocating movement thereof towards said closed end of the corresponding cylinder member; and control means for moving said actuating cam means with respect to said shaft means for adjustment of the relative position between said actuating cam portion and said actuating cam means.

10. A fuel supply arrangement, comprising; in combination, a supporting body formed with a set of parallel elongated cylindrical bores, and further formed with a connecting conduit connecting said cylindrical bores and extending in a plane normal to the axes of said cylindrical bores, said supporting body being further formed with at least one inlet conduit extending from the outside thereof to said connecting conduit; a set of cylinder members, each cylinder member mounted in one of said elongated cylindrical bores of said supporting body, each cylinder member being closed at one end and formed with at least one inlet passage communicating with said connecting conduit in said supporting body, and further formed with at least one outlet passage located at said closed end thereof and communicating with one of the cylinders; a set of springloaded check valves mounted in said supporting body, each check valve located in the out-let passage of one of said cylinder members; a set of piston members, each piston member turnably and reciproc-ably mounted in one of said cylinder members and having a cylindrical outer surface and a transversal end face located oppositely the closed end of the corresponding cylinder member, and defining in said cylinder member an operating chamber communicating Within said outlet passage in said cylinder member, each piston member being formed with at least one elongated inlet slot in said cylindrical surface thereof ending in said transvers-al end face thereof; driven shaft means rotatably mounted in said supporting body and having an axis of rotation extending parallel to, and equally spaced from the axes of said cylindrical bores and said cylinder members; a set of actuatin-g members mountediin said supporting body, each actuating member being arranged coaxially with one of said piston members and vbeing slidab'le in the direction of reciprocation thereof; cam wheel means fixedly mounted on said shaft means, said cam wheel means having an actuating cam port-ion spaced from the axis of rotation of said shaft means the same distance as said cylindrical bores, said actuating cam portion engaging during rotation of said shaft means consecutively each of said actu- .atingmembers-attire otheriend-tthereof so .as to move thetsame; .andthereby ithe; piston imember' corresponding thereto towardssaidclosed-end'of:thecorrespondingcylinder member; a set of rocking levers 'means,'each fixedly connected-atoneend' thereof to :one of said pistonmembers, each rocking l'ever means extending substantially normal to the direction of reciprocation-of said piston member, springnreans connected to said rocking lever means for urging said rocking lever means in one direction; actuating cam means mounted on said shaft means non-rotatable and slidable in axial direction of said shaft means,- and engaging with the outermost surface portions thereof the other ends of said cocking lever means consecutively during rotation of said shaft means and turning said rocking lever means against the action of said spring means whereby each of said piston members is turned in the corresponding cylinder member between a first position in which said inlet slot thereof coincides with said inlet passage in the corresponding cylinder member and a second position in which said inlet slot is angularly spaced from said inlet passage, said actuating cam means turning consecutively each of said piston members to said second position at least during part of the reciprocating movement thereof towards said closed end of the corresponding cylinder member, said outermost surface portions of said actuating cam means being located along a curve extending spaced a varying distance from the axis of rotation of said shaft means; control means engaging :and moving said actuating cam means in axial direction of said shaft means whereby portions of said outermost surface portions differently located with respect to said cam portions of said cam wheels means engage said rocking levers during rotation; and control means for moving said actuating cam means with respect to said shaft means for adjustment of the relative position between said iactu- *ating cam portion and said actuating cam means.

'11. A pump comprising in combination a cylinder member having at least one inlet passage and at least one outlet passage; a'piston member mounted in said cylinder member, one of said members being reciprocable, and one of said members being turnaible relative to the other of said members, said piston member defining in said cylinder member an operating chamber communicating with said outlet passage, and being formed with at least one inlet conduit communicating at one end thereof with said operating chamber; driven shaft means; a cam wheel fixedly mounted on said shaft means and engaging said reciprocable member'and moving the same during rotation toward the other of said members; spring means urging said reciprocable member toward said cam wheel; rocking'lever means fixedly connected at one end thereof to said t-urnable member and extending normal to the direction .of reciprocation of said reciprooable member; actuating cam means connected to said driven shaft for rotation therewith and engaging the other end of said rocking lever means for turning said turnalble member relative to the other of said members between a first position in which said inlet conduit coincides with said inlet passage and a second position in which said inlet conduit is angularly spaced-from said inlet passage, said shaft means "operatingsaid cam wheelwand said actuating'cam means in such manner that at least during part of the reciprocating movement of said reciprocable member away from the other of said members said inlet conduit is in said first position thereof, and that at least during part of the reciprocatingmovement of said reciprocating member in oppositedirection said inlet conduit is in said second position.

12. A pump comprising in combination a cylinder member having at least one inlet passage and at least one outlet passage; a piston member mounted in said cylinder member, one of said members being reciprocable, and one of said members being turnable relative to the other of said members, said piston'member defining in said cylinder member anioperating chamber communicating with said outlet passage, and being formed with at least none inlet conduit= comn1unicating at one-end thereof with saidoperating"ehamberg-driven shaft means; actuating means fixedly mounted on said shaft means engaging and reciprocating said reciprocable member; rocking lever means fixedly connected at one end thereof to said turnable member; adjustable actuating cam means movably mounted on said shaft means, said actuating cam means having the outermost surface portions thereof located along a curve and engaging the other end of said rocking lever means with said outermost surface portions for turning said turnable member relative to the other of said members between a first position in which said inlet conduit coincides with said inlet passage and a second position in which said'inlet conduit is angularly spaced from said inlet passage; and control means engaging said actuating cam means and moving the same for adjusting the timing of the turning of said turnable member with respect to the reciprocating movement of said reciprocating member, said shaft means operating said actuating means and said actuating cam means in such manner that at least during part of the reciprocating movement of said reciprocable member away from the other of said members said inlet conduit is in said first position thereof, and that at least during part of the reciprocating movement of said reciprocating member in opposite direction said inlet conduit is in said second postion.

13. A pump as claimed in claim 4 wherein said operating means include first clamping means non-rotatably guided in said supporting means, and second clamping means cooperating with said first clamping means to hold said bearing means.

14. A pump as claimed in claim 5 wherein said worm gear means is a set screw, and including a spring ring secured to said supporting means at the outer end of said set screw for preventing axial movement of the same; and screw means arranged in said supporting means coaxially with said screw at the outer end of the same so as to enclose said screw within said supporting means.

15. A pump as claimed in claim 2 and including a threaded member mounted in said supporting means and engaging said cylinder member for clamping the same to said supporting means.

16. A pump comprising, in combination, a cylinder member having at least one inlet passage and at least one outlet passage; a piston member mounted in said cylinder member and defining in the same an operating chamber communicating with said outlet passage, said piston member being formed with at least one inlet conduit communicating at one end thereof with said operating cham ber, one of said members being reciprocable relative to the other of said members for increasing and reducing, respectively, the volume of said operating chamber, and one of said members being turnable relative to the other of said members between a first position in which said inlet conduit coincides with said inlet passage and a second position in which said inlet conduit is angularly spaced from said inlet passage; drive means; first actuating means connected to said drive means and being driven by the same, said first actuating means engaging said reciprocable member for reciprocating the same; second actuating means connected to said turnable member for turning the same relative to the other of said members between said first and second positions; and adjustable control means connecting at least said second actuating means with said drive means for operating said first and second actuating means in a predetermined timed sequence in such manner that at least during part of the reciprocating movement of said reciproca'ble member for increasing the volume of said operating chamber said turnable members is in said first position thereof, and that at least during part of the reciprocable movement of said reciprocating member in opposite direction for reducing the volume of said working chamber said turnable member is in said second position.

17. A pump comprising, in combination, a cylinder member having at least one inlet passage and at least one outlet passage; a piston member mounted in said cylinder member and defining in the same an operating chamber communicating with said outlet passage, said piston member being formed with at least one inlet conduit communicating at one end thereof with said operating chamber, one of said members being reciproca'ble relative to the other of said members for increasing and reducing, respectively, the volume of said operating chamber, and one of said members being turnable relative to the other of said members between a first position in which said inlet conduit coincides with said inlet passage and a second position in which said inlet conduit is angularly spaced from said inlet passage; drive means; first actuating rotary cam means connected to said drive means and being driven by the same, said first actuating rotary cam means engaging said reciprocable member for reciprocating the same; second actuating rotary cam means connected to said turnable member for turning the same relative to the other of said members between said first and second positions; and adjustable control means connecting at least said second actuating rotary cam means with said drive means for operating said first and second actuating rotary cam means in a predetermined timed sequence in such manner that at least during part of the reciprocating movement of said reciprocable member for increasing the volume of said operating chamber said turnable member is in said first position thereof, and that at least during part of the reciprocable movement of said reciprocating member in opposite direction for reducing the volume of said working chamber said turnable member is in said second position.

References Cited in the fille of this patent UNITED STATES PATENTS 2,060,076 High Nov. 10, 1936 2,083,020 High June 8, 1937 2,083,021 High June 8, 1937 2,223,757 Dil-lstrom Dec. 3, 1940 2,286,928 Pipkin June 16, 1942 2,369,345 Folke Feb. 13, 1945 FOREIGN PATENTS 168,816 Great Britain 1921 

